Overvoltage Protection; Lu Undervoltage Protection - IMO Jaguar CUB Instruction Manual

OUn
[ 2 ]

Overvoltage protection

Problem The DC link circuit voltage was over the detection level of overvoltage.
OU1 Overvoltage occurs during the acceleration.
OU2 Overvoltage occurs during the deceleration.
OU3 Overvoltage occurs during running at constant speed.
Possible Causes
(1) The power supply voltage
was over the range of the
inverter's specifications.
(2) The acceleration time was
too short.
(3) The deceleration time was
too short for the moment
of inertia for load.
(4) Loads were suddenly
removed.
(5) Braking load was too
heavy.
(6) Malfunction caused by
noise.
LU
[ 3 ] Undervoltage protection
Problem DC link circuit voltage was below the undervoltage detection level.
Possible Causes
(1) An instantaneous power
failure occurred.
What to Check and Suggested Measures
Measure the input voltage.
Decrease the voltage to within that of the specifications.
Check if the overvoltage alarm occurs after sudden
acceleration.
Increase the acceleration time (F07, E10, and H54).
Select the S-curve pattern (H07).
Consider the use of a braking resistor.
Recalculate the deceleration torque from the moment of inertia
for load and the deceleration time.
Increase the deceleration time (F08, E11, and H54).
Enable automatic deceleration (H69=1) so that when the
DC link circuit voltage exceeds the overvoltage suppression
level, the inverter changes the deceleration time to three
times longer than the set value.
Set the rated voltage (at base frequency) (F05) to 0 to
improve braking ability.
Consider the use of a braking resistor.
- Check if the alarm occurs when loads are suddenly
removed.
- Check if the inverter operation suddenly changes from
driving operation to braking operation.
Consider the use of a braking resistor.
Compare the braking torque of the load with that of the inverter.
Set the rated voltage (at base frequency) (F05) to 0 to
improve braking ability.
Consider the use of a braking resistor.
Check if the DC link circuit voltage was below the protective
level when the alarm occurred.
Improve noise control.
Enable the auto-reset function (H04).
What to Check and Suggested Measures
Reset the alarm.
If you want to restart running the motor without making the
alarm occur, set 4 or 5 to F14 depending on load.
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